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ā[I:fset(ā)]. ā[i:ā]. (cube+(I;i) o [1(š)] = <(i1)> ā formal-cube(I) jā¶ formal-cube(I+i))
{ Auto }
1. I : fset(ā)
2. i : ā
ā¢ cube+(I;i) o [1(š)] = <(i1)> ā formal-cube(I) jā¶ formal-cube(I+i)